Are there any cautions about drinking ionized alkaline water?

You should start slowly. Set the controls to the lowest alkaline level. Assuming the water agrees with you, increase the amount you drink and the level of ionization intensity. High levels of alkalinity -- up to 9.5-10.0 -- are best for drinking water; the highest levels can be used for cooking. Drinking alkaline water can help to detoxify your body by allowing acids to be squeezed out of cells and then flushed out your body's plumbing, so to speak. This is a fantastic benefit, however in a few individuals, the detoxification effects from drinking alkaline ionized water can cause headaches and diarrhea for a short time. And for some older people, ionized water can tend, at first, to open the bowels. This is why a slow start is advised. Use the "Purified Water" setting for taking any medications that your doctor advises not to be taken with alkaline water. Do not drink the acid water that comes out of the lower spout, ever.  more

You should start slowly. Set the controls to the lowest alkaline level. Assuming the water agrees with you, increase the amount you drink and the level of ionization intensity. High levels of alkalinity -- up to 9.5-10.0 -- are best for drinking water; the highest levels can be used for cooking. Use the "Purified Water" setting for taking any medications that your doctor advises not to be taken with alkaline water. Do not drink the acid water that comes out of the lower spout.  more